📝 add timezone to list of environment variables

README.md

@@ -73,6 +73,7 @@ You can now also attach breakpoints in code for debugging purposes, by clicking
 | DOAG_EVENT_ID     | 0               | The ID of the DOAG event to read the conference agenda. |
 | MASTODON_INSTANCE | mastodon.social | The Mastodon instance used to read the posts from.      |
 | MASTODON_HASHTAG  | java            | The hashtag for the mastodon wall.                      |
+| TZ                | UTC             | The timezone used for date and time calculations.       |
 
 The environment variables will override the default values.